Globalize provides number formatting and parsing, date and time formatting and parsing, currency formatting, message formatting (ICU message format pattern), and plural support.
Globalize is based on the Unicode Consortium's Common Locale Data Repository (CLDR), the largest and most extensive...
A library of extension mehods to help convert times between time zones, add business days to a date time etc.
Hat tip no Nager Date for calculating holidays and weekends for adding business days.
Date time conversions use .Net's System.TimeZoneInfo.
Class library for Genealogy dates, which can have one or more unknown parts. Features approximate dates, before and after dates, date ranges and free text. Includes basic arithmetic and compare functions, and strategy for creating date ranges for searching. Have parsers for dates from Gedcom files...